Fan



FIG. 1 is a front view of the fan;

FIG. 2 is a rear view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is another side view thereof;

FIG. 5 is a front perspective view thereof; and,

FIG. 6 is a rear perspective view thereof. 

The ornamental design for a fan, as shown and described. 